Room temperature exciton formation in SnO2 nancrystals in SiO2:Eu matrix: quantum dot system, heat-treatment effect

Ningthoujam, Raghumani Singh, Vatsa, Rajesh Kumar, Vinu, Ajayan, Ariga, Katsuhiko and Tyagi, Avesh Kumar (2009) Room temperature exciton formation in SnO2 nancrystals in SiO2:Eu matrix: quantum dot system, heat-treatment effect. Journal of Nanoscience and Nanotechnology, 9 4: 2634-2638. doi:10.1166/jnn.2009.dk05


Author Ningthoujam, Raghumani Singh
Vatsa, Rajesh Kumar
Vinu, Ajayan
Ariga, Katsuhiko
Tyagi, Avesh Kumar
Title Room temperature exciton formation in SnO2 nancrystals in SiO2:Eu matrix: quantum dot system, heat-treatment effect
Journal name Journal of Nanoscience and Nanotechnology   Check publisher's open access policy
ISSN 1533-4880
1533-4899
Publication date 2009-04
Sub-type Article (original research)
DOI 10.1166/jnn.2009.dk05
Volume 9
Issue 4
Start page 2634
End page 2638
Total pages 5
Place of publication Valencia, CA, United States
Publisher American Scientific Publishers
Language eng
Formatted abstract
SnO 2 nanocrystals in SiO 2:Eu matrix have been prepared at a relatively low temperature of 170°C for 4 h. Selective transition probability of Eu 3+ emission could be done after a suitable excitation wavelength. The room temperature exciton formation at 285 nm for as-prepared nanoparticles is observed and this gives the Bohr's radius of 1.4 nm. Exciton formation disappears for the nanoparticles heated at 500 and 900°C. This is related to the increase in particle size with heattreatment. A wide-band-gap (4.35 eV) quantum dots is obtained and will be important in photonics and UV-lasing application.
Keyword SnO2 nanocrystals
Exciton formation
Bohr's radius
Quantum dots
Luminescence
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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